Which monitoring studies are used to assess risk after a first unprovoked seizure?

• A. CT scan only
• B. EEG and MRI
• C. Chest X-ray
• D. Ultrasound of the abdomen

Answer: (B)

Assessing risk after a first unprovoked seizure relies on both how the brain functions and what the brain looks like. An EEG records electrical activity and can reveal interictal epileptiform discharges that signal a higher likelihood of recurrent seizures and help classify the epilepsy type, guiding decisions about starting anti-seizure medication. An MRI provides a high-resolution look at brain structure to detect lesions or abnormalities—such as hippocampal sclerosis, cortical malformations, tumors, or vascular scars—that may be the source of seizures and influence prognosis and potential surgical treatment. Together, these studies give the most complete risk assessment after a first unprovoked seizure. CT scans are useful in the acute setting to rule out bleed or mass effect but are less sensitive for subtle etiologies and do not add the same prognostic information as MRI. Imaging like chest X-ray or abdominal ultrasound doesn’t address brain pathology or seizure risk, so they aren’t helpful for evaluating recurrence risk in this context.